Originally I had only 2 inches around the frame. But that was when I had only 1 pigger. Now I have 2 and they run around like crazy. So I have since put up 6" frame. Less mess on the floor. In heinsight I would have just done 6 to begin with.

P.S. My newest pigger can go through the squares in the cubes! So 6" makes me feel better.

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